package com.HuiShou.web.controller.common;

import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.*;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.HuiShou.service.impl.DetectionService;
import org.dromara.x.file.storage.core.FileInfo;
import org.dromara.x.file.storage.core.FileStorageService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import com.HuiShou.common.config.RuoYiConfig;
import com.HuiShou.common.constant.Constants;
import com.HuiShou.common.core.domain.AjaxResult;
import com.HuiShou.common.utils.StringUtils;
import com.HuiShou.common.utils.file.FileUploadUtils;
import com.HuiShou.common.utils.file.FileUtils;
import com.HuiShou.framework.config.ServerConfig;

/**
 * 通用请求处理
 * 
 * @author ruoyi
 */
@RestController
@RequestMapping("/common")
public class CommonController
{
    private static final Logger log = LoggerFactory.getLogger(CommonController.class);

    @Autowired
    private ServerConfig serverConfig;

    @Autowired
    private FileStorageService fileStorageService;

    @Autowired
    private DetectionService detectionService;

    private static final String FILE_DELIMETER = ",";

    /**
     * 通用下载请求
     * 
     * @param fileName 文件名称
     * @param delete 是否删除
     */
    @GetMapping("/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request)
    {
        try
        {
            if (!FileUtils.checkAllowDownload(fileName))
            {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = RuoYiConfig.getDownloadPath() + fileName;

            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, realFileName);
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete)
            {
                FileUtils.deleteFile(filePath);
            }
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 通用上传请求（单个）
     */
    @PostMapping("/upload")
    public AjaxResult uploadFile(MultipartFile file) {
        try {
            // 直接传递MultipartFile到服务层
            Map<String, Object> result = detectionService.detectImage(file);

            // 解码base64图片
            String base64Image = (String) result.get("processed_image");
            byte[] imageBytes = Base64.getDecoder().decode(base64Image);
            // 将字节数组保存为JPEG文件
            ByteArrayInputStream bais = new ByteArrayInputStream(imageBytes);
            BufferedImage bufferedImage = ImageIO.read(bais);
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ImageIO.write(bufferedImage, "jpg", baos);
            byte[] jpegBytes = baos.toByteArray();

            // OSS存储逻辑
            String objectName = LocalDate.now().format(DateTimeFormatter.ofPattern("yyyy/MM/dd")) + "/";
            FileInfo fileInfo = fileStorageService.of(jpegBytes)
                    .setPath(objectName)
                    .upload();
            // 检查 fileInfo.getUrl() 是否为 null
            String fileUrl = fileInfo.getUrl();
            if (fileUrl == null) {
                return AjaxResult.error("文件上传失败：无法获取文件URL");
            }

            // 处理 confidence 字段
            Object scores = result.get("scores");
            Double confidence;
            if (scores instanceof Double) {
                confidence = (Double) scores;
            } else if (scores instanceof List && !((List<?>) scores).isEmpty()) {
                // 兼容历史逻辑：取列表第一个元素
                confidence = ((Number) ((List<?>) scores).get(0)).doubleValue();
            } else {
                return AjaxResult.error("置信度数据格式异常");
            }
            AjaxResult ajax = AjaxResult.success();
            ajax.put("url", fileInfo.getUrl());
            ajax.put("fileName", fileInfo.getUrl());//因为前端的访问地址会做一个判断，如果http开头就直接显示图片
            ajax.put("newFileName", fileInfo.getUrl());
            ajax.put("originalFilename", file.getOriginalFilename());
            ajax.put("label",result.get("labels") );
            ajax.put("confidence",result.get("scores"));
//            log.info("label:{}", result.get("labels"));
//            log.info("confidence:{}", result.get("scores"));
            return ajax;
        } catch (Exception e) {
            // 增强错误处理
            String errorMsg = e.getCause() != null ? e.getCause().getMessage() : e.getMessage();
            return AjaxResult.error("处理失败: " + errorMsg);
        }

    }
//    // 安全列表转换方法
//    private <T> List<T> safeCastList(Map<String, Object> map, String key, Class<T> elementType) {
//        Object value = map.get(key);
//        if (!(value instanceof List<?>)) {
//            throw new ClassCastException("字段类型不匹配: " + key);
//        }
//
//        List<?> rawList = (List<?>) value;
//        List<T> resultList = new ArrayList<>();
//        for (Object item : rawList) {
//            if (elementType.isInstance(item)) {
//                resultList.add(elementType.cast(item));
//            } else {
//                throw new ClassCastException("列表元素类型不匹配: " + key);
//            }
//        }
//        return resultList;
//    }

    /**
     * 通用上传请求（多个）
     */
    @PostMapping("/uploads")
    public AjaxResult uploadFiles(List<MultipartFile> files) throws Exception
    {
        try
        {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            List<String> urls = new ArrayList<String>();
            List<String> fileNames = new ArrayList<String>();
            List<String> newFileNames = new ArrayList<String>();
            List<String> originalFilenames = new ArrayList<String>();
            for (MultipartFile file : files)
            {
                // 上传并返回新文件名称
                String fileName = FileUploadUtils.upload(filePath, file);
                String url = serverConfig.getUrl() + fileName;
                urls.add(url);
                fileNames.add(fileName);
                newFileNames.add(FileUtils.getName(fileName));
                originalFilenames.add(file.getOriginalFilename());
            }
            AjaxResult ajax = AjaxResult.success();
            ajax.put("urls", StringUtils.join(urls, FILE_DELIMETER));
            ajax.put("fileNames", StringUtils.join(fileNames, FILE_DELIMETER));
            ajax.put("newFileNames", StringUtils.join(newFileNames, FILE_DELIMETER));
            ajax.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMETER));
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 本地资源通用下载
     */
    @GetMapping("/download/resource")
    public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response)
            throws Exception
    {
        try
        {
            if (!FileUtils.checkAllowDownload(resource))
            {
                throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
            }
            // 本地资源路径
            String localPath = RuoYiConfig.getProfile();
            // 数据库资源地址
            String downloadPath = localPath + StringUtils.substringAfter(resource, Constants.RESOURCE_PREFIX);
            // 下载名称
            String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, downloadName);
            FileUtils.writeBytes(downloadPath, response.getOutputStream());
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }
}
